交联壳聚糖对偶氮染料的脱色研究.docVIP

交联壳聚糖对偶氮染料的脱色研究 摘要：壳聚糖因其独特的分子结构，对许多类型的染料废水具有良好的絮凝作用。在不同的染料浓度、PH、盐含量和温度条件下,采用分光光度法测得吸附后的染料浓度,得到了壳聚糖对偶氮染料的最佳吸附条件。结果表明：在固定浓度和体积的情况下，戊二醛为0.6 mL、PH为6、温度为室温、吸附时间为1.5 h时吸附条件为最佳。溶液PH和交联度对吸附有较大影响，而氯化钠浓度和温度对吸附影响很小。结构复杂的染料，脱色效果较差，其结果将为利用壳聚糖处理印染废水提供一定的理论根据。7418 关键词：壳聚糖；改性；膜；偶氮染料；吸附 Study on Sorption of Azo Dyes by Crosslinked Chitosan Membrane Abstract：Printing and dyeing wastewater is a kind of industry wastewater to be hardly treated with the characteristics of high chroma and changeful colour.The industrialized way is acombinative method with flocculation and biology.So flocculantion plays an important partin dealing with . Chitosan had good flocculating effect to many kinds of dyes because ofits special molecular structure. Under the condition of different dye concentration, PH，salt content and temperatures , adopting the spectrophotometrically to measure adsorb after the concentratiaon of the dye , the authors got the best condition of adsorbing the chitosan for acid dye .The results show that under the condition of fixedly the dye concentration and physical volume,the amount of devotion of the chitosan the adsorb was the best under the glutaric dialdehyde of 0.6 mL,PH was worth to 6,temperature for indoor temperature,time of absorb 1.5.Solution PH and degree of cross linking have great influence on the adsorption, but have very little influence of NaCl concentration and temperature on adsorption.The complex structure of dyes, the decolorization effect is poor.The result would be made use of the chitosan to treat the printing dye the waste water to providethe certain theories basis.This paper studied the synthesis of modified chitosan andits application in printing and dyeing wastewater. 壳聚糖来源于甲壳质，又称几丁质，存在于甲壳类、节枝类动物的壳体及菌类、藻类等低等植物的细胞壁中。壳聚糖是一种天然高分子化合物，是甲壳素的脱乙基产物，广泛存在于虾蟹和昆虫的外壳以及藻类的细胞壁中，自然界每年生物合成甲壳素可达10 亿吨之多。壳聚糖作为絮凝剂分子，壳聚糖分子上大量的mdash;OH和mdash;NH2能够提供与多种金属离子反应的活性吸附位点，作用机理包括配位、螯合、静电等，可用于重金属废水的处理。壳聚糖具有很好的成膜性、生物相容性和生物可降解性[3]，其降解产物在土壤中能改善微生态环境，不会造成环境污染[4]，且无毒无味，是一种绿色环境材料。壳聚